Michelin Recherche Et Technique S.a.

Francois Bataille

Francois Masson

Serge Teisseyre

Claude Ringot

Serge Teiss Yre

The present invention provides a rubber composition which when vulcanized may be used to form a safety support intended to be mounted on a wheel rim within a tire. The invention also is directed to such a support, capable of supporting a tread of the tire in the event of a drop in inflation pressure, and to a mounted assembly comprising this support. A rubber composition according to the invention comprises (phr: parts by weight per 100 parts of diene elastomer(s)): (a) a diene elastomer, (b) particles of an &#x3b1;-olefinic thermoplastic polymer having a melting point greater than or equal to 150&#xb0; C., in an amount of 5 to 30 parts by weight per 100 parts diene elastomer (phr), wherein the mean size by weight of the particles is between 50 &#x3bc;m and 500 &#x3bc;m, (c) greater than 60 phr of reinforcing filler, and (d) from 3 to 8 phr of sulphur.

Rubber composition usable in the vulcanized state as a tire safety support and such a support

The present invention provides a rubber composition which when vulcanized may be used to form a safety support intended to be mounted on a wheel rim within a tire. The invention also is directed to such a support, capable of supporting a tread of the tire in the event of a drop in inflation pressure, and to a mounted assembly comprising this support. A rubber composition according to the invention comprises (phr: parts by weight per 100 parts of diene elastomer(s)): (a) a diene elastomer, (b) particles of an &agr;-olefinic thermoplastic polymer having a melting point greater than or equal to 150&deg; C., in an amount of 5 to 30 parts by weight per 100 parts diene elastomer (phr), wherein the mean size by weight of the particles is between 50 &mgr;m and 500 &mgr;m, (c) greater than 60 phr of reinforcing filler, and (d) from 3 to 8 phr of sulphur.

The present invention provides a rubber composition which when vulcanized may be used to form a safety support intended to be mounted on a wheel rim within a tire. The invention also is directed to such a support, capable of supporting a tread of the tire in the event of a drop in inflation pressure, and to a mounted assembly comprising this support. A rubber composition according to the invention comprises (phr: parts by weight per 100 parts of diene elastomer(s)): &mdash;natural rubber or synthetic polyisoprene in a quantity of greater than or equal to 60 phr, more than 60 phr of a reinforcing white filler, and from 3 to 8 phr of sulphur.

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St-Amant-Tallende, France

Francois Bataille